CN100366903C - Apparatus and method for controlling operation of reciprocating compressor - Google Patents

Apparatus and method for controlling operation of reciprocating compressor Download PDF

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Publication number
CN100366903C
CN100366903C CNB200410085976XA CN200410085976A CN100366903C CN 100366903 C CN100366903 C CN 100366903C CN B200410085976X A CNB200410085976X A CN B200410085976XA CN 200410085976 A CN200410085976 A CN 200410085976A CN 100366903 C CN100366903 C CN 100366903C
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value
stroke
compressor
reference value
controlling
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CN1629482A (en
Inventor
刘载有
李徹雄
成知原
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LG Electronics Inc
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LG Electronics Inc
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Priority claimed from KR10-2003-0092710A external-priority patent/KR100533011B1/en
Priority claimed from KR10-2003-0092690A external-priority patent/KR100533009B1/en
Priority claimed from KR10-2003-0092709A external-priority patent/KR100533010B1/en
Priority claimed from KR10-2004-0011484A external-priority patent/KR100533042B1/en
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2201/00—Pump parameters
    • F04B2201/02—Piston parameters
    • F04B2201/0201—Position of the piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2201/00—Pump parameters
    • F04B2201/02—Piston parameters
    • F04B2201/0206—Length of piston stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/04—Motor parameters of linear electric motors
    • F04B2203/0401—Current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/04—Motor parameters of linear electric motors
    • F04B2203/0402—Voltage

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

An apparatus and method for controlling operations of a reciprocating compressor are disclosed. The apparatus includes a compressor control factor detecting unit for detecting a compressor control factor to detect a stroke value corresponding to a point where TDC (Top Dead Center) PRG 0 on the basis of a stroke estimate value of a reciprocating compressor and values of a current and a voltage applied to a motor of the reciprocating compressor; a stroke reference value determining unit for determining a stroke reference value on the basis of the detected compressor control factor; and a controller for varying a voltage applied to the reciprocating compressor according to the determined stroke reference value.

Description

Apparatus and method for controlling operation of reciprocating compressor
Technical Field
The present invention relates to a reciprocating compressor, and more particularly, to an apparatus and method for controlling an operation of a reciprocating compressor.
Background
Generally, a reciprocating compressor compresses refrigerant circulating inside a cooling unit to a high temperature and a high pressure while a piston linearly and reciprocally moves in a cylinder. The reciprocating compressor can be classified into a reciprocating type and a linear type depending on how the piston is driven.
In the reciprocating type reciprocating compressor, a crank shaft is coupled to a rotating motor, and a piston is coupled to the crank shaft, thereby linearly and reciprocally moving the piston by using a rotational force of the rotating motor.
In the linear type reciprocating compressor, a piston is directly connected to a linear motor, thereby linearly and reciprocally moving the piston by using a linear motion of the linear motor.
Since the linear type reciprocating compressor does not require a crank shaft for converting a rotational motion into a linear motion, it has relatively small frictional loss and thus has high compression efficiency compared to a general compressor.
In addition, the linear reciprocating compressor can control a compression ratio by controlling a voltage applied to the motor, which can control a freezing capacity of the cooling unit.
An apparatus for controlling an operation of a reciprocating compressor will now be described with reference to fig. 1.
Fig. 1 is a block diagram illustrating an apparatus for controlling an operation of a conventional reciprocating compressor.
As shown in fig. 1, the apparatus for controlling an operation of a reciprocating compressor includes: a voltage detector 15 for detecting a voltage applied to the compressor motor; a current detector 14 for detecting a current applied to the compressor motor; a stroke estimator 16 estimating a stroke based on the detected voltage, the detected current, and a parameter regarding the motor; a comparator 11 for comparing the estimated value of the stroke with a reference value of the stroke and outputting a difference signal according to the comparison result; and a controller 12 controlling a stroke of the motor by varying a voltage applied to the motor based on the output difference signal.
A method for controlling an operation of the reciprocating compressor according to the conventional art will now be described with reference to fig. 2.
Fig. 2 is a flowchart of a method for controlling an operation of a reciprocating compressor according to a conventional art.
As shown in fig. 2, the method for controlling the operation of the reciprocating compressor includes: detecting values of voltage and current applied to the compressor motor (step S21); calculating a stroke estimate value based on the detected voltage value, the detected current value, and the motor parameter (step S22); comparing the calculated stroke estimate value with the stroke reference value (step S23); reducing the voltage applied to the motor if the stroke estimate is greater than the stroke reference; and if the stroke estimate value is smaller than the stroke reference value, the voltage applied to the motor is increased (step S25).
A method for controlling the operation of the reciprocating compressor will be described in detail as follows.
First, the voltage detector 15 detects a voltage value applied to the compressor motor in every predetermined period, and outputs the detected voltage value to the stroke estimator 16. The current detector 14 detects a current value applied to the compressor motor and outputs the detected current value to the stroke estimator 16 (step S21).
The stroke estimator 16 applies the detected current value, the detected voltage value, and a motor parameter (e.g., resistance or conductance of the motor) to equation (1) shown below to calculate a stroke estimate value, and outputs the calculated stroke estimate value to the comparator 11 (step S22).
Equation (1)
Where α is the motor constant, V M Is the voltage of the motor, "R" is the resistance of the motor, "L" is the inductance of the motor, and "i" is the current of the motor.
The comparator 11 compares the output stroke estimate value with the stroke reference value, generates a difference signal according to the comparison result, and outputs the generated difference signal to the controller 12 (step S23).
The controller 12 controls the stroke of the compressor by varying the voltage applied to the motor based on the inputted difference signal. In this case, if the stroke estimate value is greater than the stroke reference value, the controller decreases the voltage applied to the motor (step S24). If the stroke estimate is less than the stroke reference, the controller 12 increases the voltage applied to the motor (step S25).
In this way, the apparatus for controlling the operation of the conventional reciprocating compressor stably drives the compressor by uniformly controlling the stroke by varying the voltage applied to the motor.
However, the conventional apparatus for controlling the operation of the reciprocating compressor has the following problems.
That is, since the stroke of the compressor is estimated based on motor parameters such as a motor constant, a motor resistance, a motor inductance, and a motor current, a deviation of the motor parameters causes an error in the estimated stroke of the compressor.
Disclosure of Invention
Accordingly, an object of the present invention is to provide an apparatus and method for controlling an operation of a reciprocating compressor capable of precisely controlling a stroke of the compressor by correcting a stroke deviation due to a deviation of a motor parameter based on a stroke value corresponding to a point where TDC (top dead center) ≈ 0.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided an apparatus for controlling an operation of a reciprocating compressor, the apparatus comprising: a compressor control factor detecting unit for detecting a compressor control factor to detect a stroke value corresponding to a point of TDC (top dead center) ≈ 0 based on a stroke estimate value of the reciprocating compressor and a voltage value and a current value applied to a motor of the reciprocating compressor; a stroke reference value determining unit for determining a stroke reference value based on the detected compressor control factor; and a controller for varying a voltage applied to the reciprocating compressor according to the determined stroke reference value.
To achieve the above object, there is also provided a method for controlling an operation of a reciprocating compressor, the method including: detecting a compressor control factor for detecting a stroke value corresponding to a point where TDC (top dead center) ≈ 0 based on a stroke estimate value of the reciprocating compressor and a voltage value and a current value applied to a motor of the reciprocating compressor; determining a stroke reference value based on the detected compressor control factor; and varying a voltage applied to the reciprocating compressor according to the determined stroke reference value.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
In the drawings:
fig. 1 is a block diagram illustrating an apparatus for controlling an operation of a reciprocating compressor according to a conventional art;
fig. 2 is a flowchart of a method for controlling an operation of a reciprocating compressor according to a conventional art;
fig. 3 is a block diagram illustrating an apparatus for controlling an operation of a reciprocating compressor according to the present invention;
figure 4 is a flow chart of a method for controlling an operation of a reciprocating compressor according to the present invention;
fig. 5 is a block diagram illustrating an apparatus for controlling an operation of a reciprocating compressor according to a first embodiment of the present invention;
fig. 6 is a flowchart of a method for controlling an operation of a reciprocating compressor according to a first embodiment of the present invention;
fig. 7A and 7B are graphs showing a principle for detecting an inflection point of a stroke determining constant according to the first embodiment of the present invention;
fig. 8 is a block diagram illustrating an apparatus for controlling an operation of a reciprocating compressor according to a second embodiment of the present invention;
fig. 9 is a flowchart of a method for controlling an operation of a reciprocating compressor according to a second embodiment of the present invention;
figure 10 is a block diagram illustrating an apparatus for controlling an operation of a reciprocating compressor according to a third embodiment of the present invention;
fig. 11 is a flowchart of a method for controlling an operation of a reciprocating compressor according to a third embodiment of the present invention;
figure 12 is a block diagram illustrating an apparatus for controlling an operation of a reciprocating compressor according to a fourth embodiment of the present invention;
fig. 13 is a flowchart of a method for controlling an operation of a reciprocating compressor according to a fourth embodiment of the present invention.
Detailed Description
The detailed description which follows is directed to preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.
An apparatus and method for controlling an operation of a reciprocating compressor capable of precisely controlling a stroke of the compressor by correcting a stroke deviation generated due to a motor parameter deviation based on a stroke value corresponding to a point where TDC (top dead center) ≈ 0 will now be described in accordance with a preferred embodiment of the present invention. Here, the TDC (top dead center) approximately equal to 0 means that a space corresponding to an upper clearance volume of the piston in the compressor is substantially '0'.
Fig. 3 is a block diagram illustrating an apparatus for controlling an operation of a reciprocating compressor according to the present invention.
As shown in fig. 3, the apparatus for controlling an operation of a reciprocating compressor according to the present invention comprises: a current detector 14 for detecting a current applied to the compressor motor; a voltage detector 15 for detecting a voltage applied to the compressor motor; a stroke predictor 16 that calculates a stroke estimate value based on the detected voltage value and current value; a compressor control factor detecting unit 17 for detecting a compressor control factor for detecting a stroke value corresponding to a point of TDC (top dead center) ≈ 0 based on the detected voltage value and current value and the calculated stroke estimate value; a stroke reference value determining unit 18 for determining a stroke reference value based on the detected compressor control factor; a comparator 11 for comparing the determined stroke reference value with the calculated stroke estimate value and outputting a difference signal according to the comparison result; and a controller 12 for varying a voltage applied to the compressor based on the outputted difference signal.
A method for controlling the operation of the reciprocating compressor constructed as described above will now be explained with reference to fig. 4.
Fig. 4 is a flowchart of a method for controlling an operation of a reciprocating compressor according to the present invention.
As shown in fig. 4, the method for controlling an operation of a reciprocating compressor according to the present invention includes: detecting a current value and a voltage value applied to a compressor motor (step S41); calculating a stroke estimate value based on the detected voltage value and current value (step S42) to detect a compressor control factor for detecting a stroke value corresponding to a point where TDC (top dead center) ≈ 0 based on the detected voltage value and current value and the calculated stroke estimate value (step S43); determining a stroke reference value based on the detected compressor control factor (step S44); and varies the voltage applied to the compressor based on the determined stroke reference value and the calculated stroke estimate value (step S45).
A method for controlling the operation of the reciprocating compressor will now be described in detail.
First, the current detector 14 detects a current value applied to the compressor motor in every predetermined period, and the voltage detector 15 detects a voltage value applied to the compressor motor (step S41).
The stroke estimator 16 calculates a stroke estimate value of the compressor based on the detected current value and voltage value (step S42).
The compressor control factor detecting unit 17 detects a compressor control factor for detecting a stroke value corresponding to a point where TDC (top dead center) ≈ 0 based on the detected current value and voltage value and the calculated stroke estimate value (step S43). Here, the compressor control factor may preferably be a stroke determination constant of the compressor, a gas spring constant (gas spring constant) of the compressor, a damping coefficient of the compressor, and a power value of the compressor.
A process of detecting a stroke value corresponding to a point where TDC (top dead center) ≈ 0 by the compressor control factor will now be described as follows.
The stroke reference value determining unit 18 determines a stroke reference value based on the detected compressor control factor and applies the determined stroke reference value to the comparator 11. That is, the stroke reference value determining unit 18 determines the stroke reference value of the current period changed by the predetermined value as the stroke reference value based on the compressor control factor (step S44).
The comparator 11 compares the determined stroke reference value with the calculated stroke estimate value (step S451) and outputs a difference signal to the controller 12 according to the comparison result, based on which the controller 12 can change the compressor stroke.
That is, if the determined stroke reference value is greater than the calculated stroke estimate value, the controller 12 increases the voltage applied to the compressor motor by a predetermined level (step S452). If the determined stroke reference value is less than the calculated stroke estimate value, the controller 12 decreases the voltage applied to the compressor motor by a predetermined level (step S453).
The first to fourth embodiments of the apparatus and method for controlling an operation of a reciprocating compressor are implemented by using a stroke determining constant, an aero elastic constant, a damping coefficient, and an inflection point of a power value as a compressor control factor for detecting a stroke value corresponding to a point where TDC (top dead center) is approximately equal to 0.
A process of detecting a stroke value corresponding to a point where the TDC (top dead center) ≈ 0 according to each embodiment of the present invention will now be described.
Fig. 5 is a block diagram illustrating an apparatus for controlling an operation of a reciprocating compressor according to a first embodiment of the present invention.
As shown in fig. 5, the apparatus for controlling an operation of a reciprocating compressor according to the first embodiment of the present invention comprises: a stroke determination constant calculation unit 171 for calculating a stroke determination constant based on the stroke estimate calculated in the stroke estimator 16 and the current detected in the current detector 14; a stroke determination constant inflection point detecting unit 172 for detecting an inflection point of a stroke determination constant based on the calculated stroke determination constant and a stroke determination constant of a previous cycle; and a stroke reference value determining unit 18 for determining a stroke reference value based on the inflection point of the detected stroke determination constant.
A method for controlling the operation of the reciprocating compressor according to the first embodiment of the present invention will now be described with reference to fig. 6.
As shown in fig. 6, the method for controlling an operation of a reciprocating compressor according to the first embodiment of the present invention includes: calculating a stroke determination constant based on a current value applied to a motor of the compressor and a stroke estimate value of the compressor (step S63); determining whether an inflection point of the stroke determination constant has been generated based on the calculated stroke determination constant and the stroke determination constant of the previous cycle (step S641); and, if an inflection point of the stroke determination constant has been generated, the current operating frequency decreased by a predetermined value is determined as the stroke reference value (step S642).
In step S641, if an inflection point of the stroke determining constant is not generated, the current operating frequency increased by a predetermined value is determined as the stroke reference value.
The step of determining the stroke reference value based on the stroke determination constant in the method for controlling the operation of the reciprocating compressor according to the first embodiment of the present invention will now be described in detail as follows.
First, the stroke determination constant is defined as a value obtained by dividing the detected current value by the calculated stroke estimate value, or as a value obtained by dividing the calculated stroke estimate value by the detected current value. The stroke determination constant calculation unit 171 calculates the stroke determination constant by equation (2) shown below:
Figure C20041008597600151
equation (2)
Where α is a motor constant, "K" is an elastic constant of the compressor, "m" is a mass of the compressor, "ω" is an operating frequency of the compressor, and "c" is a viscosity coefficient of the compressor.
Subsequently, the stroke determination constant inflection point detecting unit 172 detects an inflection point of the calculated stroke determination constant (step S641).
The principle of obtaining the inflection point of the stroke determining constant will now be described with reference to fig. 7A and 7B.
Fig. 7A and 7B are graphs showing the principle for detecting an inflection point of a stroke determining constant according to the first embodiment of the present invention.
The inflection point of the stroke determining constant means a point at which the value of the inflection point of the stroke determining constant changes from a descending section to an ascending section as shown in fig. 7A, or a point at which the value of the inflection point of the stroke determining constant changes from a ascending section to a descending section as shown in fig. 7B.
Accordingly, the stroke determination constant inflection point detecting unit 172 may determine whether an inflection point of the stroke determination constant occurs by comparing the calculated stroke determination constant value with the stroke determination constant value of the previous cycle. Here, the stroke value at the inflection point of the stroke determination constant is a stroke value at a point corresponding to TDC ≈ 0.
Therefore, if the inflection point of the stroke determining constant has occurred, the stroke reference value determining unit 18 determines the stroke reference value of the current cycle decreased by the predetermined value as the stroke reference value (step S642), and if the inflection point of the stroke determining constant has not occurred, the stroke reference value determining unit 18 determines the stroke reference value of the current cycle increased by the predetermined value as the stroke reference value (step S643).
An apparatus for controlling an operation of a reciprocating compressor according to a second embodiment of the present invention, which employs a aero-elastic constant as a compressor control factor, will now be described.
Fig. 8 is a block diagram illustrating an apparatus for controlling an operation of a reciprocating compressor according to a second embodiment of the present invention.
As shown in fig. 8, the apparatus for controlling an operation of a reciprocating compressor according to the second embodiment of the present invention comprises: a aeroelastic constant calculation unit 173 for calculating an aeroelastic constant based on the stroke estimate calculated in the stroke estimator 16 and the current detected in the current detector 14; an aeroelastic constant inflection point detecting unit 174 for detecting an inflection point of an aeroelastic constant based on the calculated aeroelastic constant and the aeroelastic constant of the previous cycle; and a stroke reference value determining unit 18 for determining a stroke reference value based on the inflection point of the detected stroke determination constant.
A method for controlling an operation of a reciprocating compressor according to a second embodiment of the present invention will now be described with reference to fig. 9.
Fig. 9 is a flowchart of a method for controlling an operation of a reciprocating compressor according to a second embodiment of the present invention.
As shown in fig. 9, the method for controlling the operation of the reciprocating compressor according to the present invention comprises: calculating an aero-elastic constant based on a current value applied to a motor of the compressor and a stroke prediction value of the compressor (step S93); determining whether an inflection point of the aero-elastic constant has occurred based on the calculated aero-elastic constant and the aero-elastic constant of the previous cycle (step S941); and, if the inflection point of the aero-elastic constant has occurred, the current stroke reference value decreased by the predetermined value is determined as the stroke reference value (step S942).
In step S941, if there is no inflection point of the aero-elastic constant, the current stroke reference value increased by a predetermined value is determined as the stroke reference value (step S943).
The aero elastic constant adopted by the method for controlling the operation of the reciprocating compressor according to the second embodiment of the present invention will now be described by equation (3) as follows:
Figure C20041008597600171
equation (3)
Where α is the motor constant, θ is the potential difference between current and stroke, and "m" is compressionThe mass of the machine, "ω" is the operating frequency of the compressor, and k m Is the mechanical elastic constant of the compressor.
The steps of determining whether an inflection point of the aero-elastic constant occurs and changing the stroke reference value according to the determination result are the same as those in the first embodiment, and thus, a description thereof is omitted.
An apparatus for controlling an operation of a reciprocating compressor according to a third embodiment of the present invention, which employs a damping coefficient as a compressor control factor, will now be described.
Fig. 10 is a block diagram illustrating an apparatus for controlling an operation of a reciprocating compressor according to a third embodiment of the present invention.
As shown in fig. 10, an apparatus for controlling an operation of a reciprocating compressor according to a third embodiment of the present invention includes: a damping coefficient calculation unit 175 for calculating a damping coefficient based on the stroke estimate calculated in the stroke estimator 16 and the current detected in the current detector 14; a damping coefficient inflection point detecting unit 176 for detecting an inflection point of the damping coefficient based on the calculated damping coefficient and the damping coefficient of the previous cycle; and a stroke reference value determining unit 18 for determining a stroke reference value based on the inflection point of the detected damping coefficient.
A method for controlling the operation of the reciprocating compressor according to the third embodiment of the present invention will now be described with reference to fig. 11.
Fig. 11 is a flowchart of a method for controlling an operation of a reciprocating compressor according to a third embodiment of the present invention.
As shown in fig. 11, the method for controlling the operation of the reciprocating compressor includes: calculating a damping coefficient based on a current value applied to a motor of the compressor and a stroke estimate value of the compressor (step S113); determining whether an inflection point of the damping coefficient has occurred based on the calculated damping coefficient and the damping coefficient of the previous cycle (step S1141); and, if the inflection point of the damping coefficient has occurred, the current stroke reference value decreased by a predetermined value is determined as the stroke reference value (step S1142).
In step S1141, if an inflection point of the damping coefficient does not occur, the current stroke reference value increased by a predetermined value is determined as the stroke reference value (step S1143).
The damping coefficient employed by the method for controlling the operation of the reciprocating compressor according to the third embodiment of the present invention will now be described by equation (4) as follows:
Figure C20041008597600181
equation (4)
Where α is the motor constant, θ is the potential difference between current and stroke, and "ω" is the operating frequency of the compressor.
The steps of determining whether an inflection point of the damping coefficient occurs and changing the stroke reference value according to the determination result are the same as those in the first embodiment of the present invention, and thus, a description thereof is omitted.
An apparatus for controlling an operation of a reciprocating compressor according to a fourth embodiment of the present invention, which employs a power value as a compressor control factor, will now be described.
Fig. 12 is a block diagram illustrating an apparatus for controlling an operation of a reciprocating compressor according to a fourth embodiment of the present invention.
As shown in fig. 12, an apparatus for controlling an operation of a reciprocating compressor according to a fourth embodiment of the present invention includes: a power value calculation unit 177 for calculating a power value based on the voltage detected in the voltage detector 15 and the current detected in the current detector 14; a power value inflection point detecting unit 178 for detecting an inflection point of a power value based on the calculated power value and a power value of a previous cycle; and a stroke reference value determining unit 18 for determining a stroke reference value based on the inflection point of the detected power value.
A method for controlling the operation of the reciprocating compressor according to the fourth embodiment of the present invention will now be described with reference to fig. 13.
Fig. 13 is a flowchart of a method for controlling an operation of a reciprocating compressor according to a fourth embodiment of the present invention.
As shown in fig. 13, a method for controlling an operation of a reciprocating compressor according to a fourth embodiment of the present invention includes: calculating a power value based on the current value and the voltage value applied to the compressor motor (step S133); comparing the calculated power value with the power value of the previous cycle and determining whether an inflection point of the power value has occurred based on the comparison result (step S1341); and, if an inflection point of the power value has occurred, the current stroke reference value decreased by a predetermined value is determined as the stroke reference value.
In step S1341, if an inflection point of the power value does not occur, the current stroke reference value increased by a predetermined value is determined as the stroke reference value (step S1343).
The power value of the compressor employed in the method for controlling the operation of the reciprocating compressor according to the fourth embodiment of the present invention refers to a value obtained by multiplying a voltage value by a current value applied to a motor of the compressor.
The steps of determining whether the inflection point of the power value occurs and changing the stroke reference value according to the determination result are the same as those in the first embodiment, and thus, a description about the steps is omitted.
As described so far, the apparatus and method for controlling an operation of a reciprocating compressor according to the first to fourth embodiments of the present invention have the following advantages.
That is, for example, since the stroke deviation caused by the motor parameter deviation is corrected based on the stroke value corresponding to the point where the TDC (top dead center) ≈ 0, the stroke of the compressor may be accurately controlled.
As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalence of such metes and bounds are therefore intended to be embraced by the appended claims.

Claims (24)

1. An apparatus for controlling an operation of a reciprocating compressor, characterized in that the apparatus comprises:
a compressor control factor detecting unit for detecting a compressor control factor to detect a stroke value corresponding to a point where TDC ≈ 0 based on a stroke estimate value of the reciprocating compressor and a voltage value and a current value applied to a motor of the reciprocating compressor;
a stroke reference value determining unit for determining a stroke reference value based on the detected compressor control factor; and
and a controller for varying a voltage applied to the reciprocating compressor according to the determined stroke reference value.
2. The apparatus for controlling an operation of a reciprocating compressor according to claim 1, wherein the compressor control factor is one of a stroke determination constant, an aero-elastic constant, a damping coefficient and a power value.
3. The apparatus for controlling an operation of a reciprocating compressor according to claim 1, wherein the compressor control factor detecting unit comprises:
a stroke determination constant calculation unit for calculating a stroke determination constant based on a stroke estimate value of the compressor and a current value applied to a motor of the compressor; and
and a stroke determination constant inflection point detecting unit for detecting an inflection point of the calculated stroke determination constant.
4. The apparatus for controlling an operation of a reciprocating compressor according to claim 3, wherein the stroke determining constant is one of a value obtained by dividing a stroke value of the compressor by a current value applied to a motor of the compressor and a value obtained by dividing a current value applied to a motor of the compressor by a stroke value of the compressor.
5. The apparatus for controlling an operation of a reciprocating compressor according to claim 3, wherein the stroke reference value determining unit determines the stroke reference value for the current period decreased by a predetermined value as the stroke reference value when an inflection point of the stroke determining constant is detected, and determines the stroke reference value for the current period increased by the predetermined value as the stroke reference value when the inflection point of the stroke determining constant is not detected.
6. The apparatus for controlling an operation of a reciprocating compressor according to claim 1, wherein the compressor control factor detecting unit comprises:
a aero elastic constant calculation unit for calculating an aero elastic constant based on a stroke estimate value of the compressor and a current value applied to a motor of the compressor; and
and the aeroelastic constant inflection point detection unit is used for detecting the inflection point of the calculated aeroelastic constant.
7. The apparatus for controlling an operation of a reciprocating compressor according to claim 6, wherein the stroke reference value determining unit determines the stroke reference value for a current period decreased by a predetermined value as the stroke reference value when an inflection point of the aero elastic constant is detected, and determines the stroke reference value for a current period increased by a predetermined value as the stroke reference value when the inflection point of the aero elastic constant is not detected.
8. The apparatus for controlling an operation of a reciprocating compressor according to claim 1, wherein the compressor control factor detecting unit comprises:
a damping coefficient calculation unit for calculating a damping coefficient based on a stroke estimate value of the compressor and a current value applied to a motor of the compressor; and
and the damping coefficient inflection point detection unit is used for detecting the inflection point of the calculated damping coefficient.
9. The apparatus for controlling an operation of a reciprocating compressor according to claim 8, wherein the stroke reference value determining unit determines the stroke reference value for a current period decreased by a predetermined value as the stroke reference value when an inflection point of the damping coefficient is detected, and determines the stroke reference value for a current period increased by a predetermined value as the stroke reference value when the inflection point of the damping coefficient is not detected.
10. The apparatus for controlling an operation of a reciprocating compressor according to claim 1, wherein the compressor control factor detecting unit comprises:
a power calculating unit for calculating a power value based on a current value and a voltage value applied to the compressor motor; and
and a power inflection point detecting unit for detecting an inflection point of the calculated power value.
11. The apparatus for controlling an operation of a reciprocating compressor according to claim 10, wherein the power value is a value obtained by multiplying a current value applied to the motor of the compressor by a voltage value.
12. The apparatus for controlling an operation of a reciprocating compressor according to claim 10, wherein the stroke reference value determining unit determines a stroke reference value for a current period decreased by a predetermined value as the stroke reference value when the inflection point of the power value is detected, and determines a stroke reference value for a current period increased by a predetermined value as the stroke reference value when the inflection point of the power value is not detected.
13. A method for controlling an operation of a reciprocating compressor, characterized in that the method comprises:
detecting a compressor control factor to detect a stroke value corresponding to a point of TDC ≈ 0 based on a stroke estimate value of the reciprocating compressor and a voltage value and a current value applied to a motor of the reciprocating compressor;
determining a stroke reference value based on the detected compressor control factor; and is
The voltage applied to the reciprocating compressor is changed according to the determined stroke reference value.
14. The method for controlling an operation of a reciprocating compressor according to claim 13, wherein the compressor control factor is one of a stroke determination constant, an aero-elastic constant, a damping coefficient and a power value.
15. The method for controlling an operation of a reciprocating compressor according to claim 13, wherein the step of detecting a compressor control factor comprises:
calculating a stroke determination constant based on a stroke estimate value of the compressor and a current value applied to a motor of the compressor; and is provided with
Detecting the calculated stroke determines the inflection point of the constant.
16. The method for controlling an operation of a reciprocating compressor according to claim 15, wherein the stroke determining constant is one of a value obtained by dividing a stroke value of the compressor by a current value applied to a motor of the compressor and a value obtained by dividing a current value applied to a motor of the compressor by a stroke value of the compressor.
17. The method for controlling an operation of a reciprocating compressor according to claim 15, wherein in the determining of the stroke reference value, when an inflection point of a stroke determination constant is detected, the stroke reference value of the current period decreased by a predetermined value is determined as the stroke reference value, and when the inflection point of the stroke determination constant is not detected, the stroke reference value of the current period increased by a predetermined value is determined as the stroke reference value.
18. The method for controlling an operation of a reciprocating compressor according to claim 13, wherein the step of detecting the compressor control factor comprises:
calculating an aeroelastic constant based on a stroke estimated value of the compressor and a current value applied to a motor of the compressor; and is
The inflection point of the calculated aeroelastic constant is detected.
19. The method for controlling an operation of a reciprocating compressor according to claim 18, wherein in the determining of the stroke reference value, when an inflection point of an aero elastic constant is detected, the stroke reference value of the current period decreased by a predetermined value is determined as the stroke reference value, and when the inflection point of the aero elastic constant is not detected, the stroke reference value of the current period increased by a predetermined value is determined as the stroke reference value.
20. The method for controlling an operation of a reciprocating compressor according to claim 13, wherein the step of detecting a compressor control factor comprises:
calculating a damping coefficient based on a stroke estimate value of the compressor and a current value applied to a motor of the compressor; and is
And detecting the inflection point of the calculated damping coefficient.
21. The method for controlling an operation of a reciprocating compressor according to claim 20, wherein in the determining of the stroke reference value, when an inflection point of the damping coefficient is detected, the stroke reference value of the current period decreased by a predetermined value is determined as the stroke reference value, and when the inflection point of the damping coefficient is not detected, the stroke reference value of the current period increased by a predetermined value is determined as the stroke reference value.
22. The method for controlling an operation of a reciprocating compressor according to claim 13, wherein the step of detecting a compressor control factor comprises:
calculating a power value based on a current value and a voltage value applied to a compressor motor; and is
An inflection point of the calculated power value is detected.
23. The method for controlling an operation of a reciprocating compressor of claim 22, wherein the power value is a value obtained by multiplying a current value applied to the compressor motor by a voltage value.
24. The method for controlling an operation of a reciprocating compressor according to claim 22, wherein in the step of determining the stroke reference value, when an inflection point of the power value is detected, the stroke reference value for the current period decreased by a predetermined value is determined as the stroke reference value, and when the inflection point of the power value is not detected, the stroke reference value for the current period increased by a predetermined value is determined as the stroke reference value.
CNB200410085976XA 2003-12-17 2004-10-25 Apparatus and method for controlling operation of reciprocating compressor Expired - Fee Related CN100366903C (en)

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KR10-2003-0092710A KR100533011B1 (en) 2003-12-17 2003-12-17 Driving control apparatus and method for reciprocating compressor
KR10-2003-0092690A KR100533009B1 (en) 2003-12-17 2003-12-17 Driving control apparatus and method for reciprocating compressor
KR92709/2003 2003-12-17
KR92690/2003 2003-12-17
KR92710/2003 2003-12-17
KR10-2003-0092709A KR100533010B1 (en) 2003-12-17 2003-12-17 Driving control apparatus and method for reciprocating compressor
KR11484/2004 2004-02-20
KR10-2004-0011484A KR100533042B1 (en) 2004-02-20 2004-02-20 Driving control apparatus and method for reciprocating compressor

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